Methionine functions as the initial amino acid in most proteins synthesized in the human body. It serves as the starting point for protein elongation during the process of protein synthesis. During protein synthesis, Methionine helps carry other amino acids to connect them together into chains that then fold into the complex 3D structures that make up the various proteins in the body https://www.zupyak.com/p/4501850/t/exploring-the-role-of-methionine-in-human-physiology-and-biochemical-pathways